[mmorris]

check with your state's Secretary of State office to see if there are any additional steps that must be taken. Many states require foreign-registered LLCs and corporations to submit an "application for authority to transact" or otherwise register with them.

Definitely important to check on the rules specific to your state.

In addition to just acquiring permission to operate, there are sometimes tax specific requirements too. For example, in New York there is a separate, state-level S-corporation election. Even if you are already a federal S-corp you need to submit to the state in order to be treated as an S-corp on your state taxes.